/Engine/Source/Runtime/Foliage/Public/InstancedFoliage.h
void MoveInstances ( [AInstancedFoliageActor](API\Runtime\Foliage\AInstancedFoliageActor) * InToIFA, const [TSet](API\Runtime\Core\Containers\TSet)< int32 > & InInstancesToMove, bool bKeepSelection )